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Re:I Didn’t Learn Unix by Reading All the Manpages by JdeBP on Wednesday May 24, 2023 @08:21PM (#36065704)
My educated guess is that something is trying to italicize various keywords, and whatever text processing is going on isn't working, but producing bogus "In" literal text instead.

.I is the "an" macro for italics, after all.

Re:I Didn’t Learn Unix by Reading All the Manpages by JdeBP on Wednesday May 24, 2023 @11:40PM (#36066828)
Compare what one sees when the text processing works, and what parts are italicized.

* https://tty0.social/@JdeBP/110427220635184435

It even prettifies those ``'' quotes, notice. This is vanilla older FreeBSD man, using groff, but actually allowing groff to do the things that it is capable of.

Re:I Didn’t Learn Unix by Reading All the Manpages by vulcan01 on Thursday May 25, 2023 @11:29AM (#36072010)
This matches what I see using less as manpager and every terminal I have installed on MacOS (Apple Terminal, kitty, alacritty+Tmux, iTerm).